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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift open source project
//
// Copyright (c) 2021-2023 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See http://swift.org/LICENSE.txt for license information
// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
//===----------------------------------------------------------------------===//
//
// This source file is part of the Vapor open source project
//
// Copyright (c) 2017-2020 Vapor project authors
// Licensed under MIT
//
// See LICENSE for license information
//
// SPDX-License-Identifier: MIT
//
//===----------------------------------------------------------------------===//
import Foundation
// Source: https://github.com/vapor/jwt-kit/blob/master/Sources/JWTKit/Utilities/Base64URL.swift
extension DataProtocol {
func base64URLDecodedBytes() -> Data? {
var data = Data(self)
data.base64URLUnescape()
return Data(base64Encoded: data)
}
func base64URLEncodedBytes() -> Data {
var data = Data(self).base64EncodedData()
data.base64URLEscape()
return data
}
}
extension Data {
/// Converts base64-url encoded data to a base64 encoded data.
///
/// https://tools.ietf.org/html/rfc4648#page-7
mutating func base64URLUnescape() {
for i in 0 ..< self.count {
switch self[i] {
case 0x2D: self[self.index(self.startIndex, offsetBy: i)] = 0x2B
case 0x5F: self[self.index(self.startIndex, offsetBy: i)] = 0x2F
default: break
}
}
/// https://stackoverflow.com/questions/43499651/decode-base64url-to-base64-swift
let padding = count % 4
if padding > 0 {
self += Data(repeating: 0x3D, count: 4 - padding)
}
}
/// Converts base64 encoded data to a base64-url encoded data.
///
/// https://tools.ietf.org/html/rfc4648#page-7
mutating func base64URLEscape() {
for i in 0 ..< self.count {
switch self[i] {
case 0x2B: self[self.index(self.startIndex, offsetBy: i)] = 0x2D
case 0x2F: self[self.index(self.startIndex, offsetBy: i)] = 0x5F
default: break
}
}
self = split(separator: 0x3D).first ?? .init()
}
}
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